PC temperate

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Cooler is better, but the i7 can handle pretty high temperatures.  50c - 60c isn't abnormal.  100c is where it starts shutting cores down.

Yes, the i7 is better at handling higher temperatures than previous family cpus, and 51C isn't bad.  Why is your AUX sensor so high, though?  What is it reading?

Actually temps in the 50's for an idling i7 are a bit high.    I've typically seen i7s run in the high 30's, low 40's when not under load.

SpeedFan is good, but only if you're sure the motherboard sensors are correctly supported by the version you're using.    Rather than playing with its sensor settings, install CoreTemp and see what it shows for the CPU temps.    http://www.alcpu.com/CoreTemp/

CoreTemp will also show the temps for each individual core of the CPU.

I'm using core I7 920, and norprene watercool.
but you know there is very strange that evry time boot up the bios says " New CPU Installed"
I had tried update bios to newest version but still same problem, mainboard is P6T SE ASUS.
I tried put some new scream between CPU and Norprene nothing changed.
Is it the problem from PSU cause I'm using small one 450w only for 11GB ram hdd dvd VGA card 512/128bit ?

you can calculate the power you need -  and leave a fair margin : http://extreme.outervision.com/PSUEngine      
also - don't put on much heat paste, 1 drop is enough to fill the crevasses
>>  evry time boot up the bios says " New CPU Installed"  <<  this can be caused ba a low bios battery - test it , it should read 3 V ; or replace it

You have 11GB RAM?  That's a very odd quantity.

Your +12v reading of 11.25v seems suspicious - I would try a different power supply, or verify in the BIOS what the +12v rail is at.

What BIOS version is on your motherboard?

The i7-920, depending on the rev # you have, may require at least version 203.   If you have an older version, your issue may simply be that you need an updated BIOS.

garycase: my bios version is newest, I updated it already.
callandor: " old quantity" what do you mean with it, maybe I have to update my PSU to 700w, is it ok?
nobus: have just replaced new one 2 weeks ago
I read on Asus support page or somewhere that P6T SE newest version is not support I7 920, could you please verify this information please!

did you calculate what you need ?
adn ok  - you replaced the battery (i guess) but did you measure it?

The P6T SE supports all the i7 Bloomfield cpus, so the i7-920 is part of that.  Besides, if it didn't support it, you wouldn't be able to boot up.

>" old quantity" what do you mean with it
I was asking about your "I'm using small one 450w only for 11GB ram" statement, which lists 11GB RAM - that is not a typical quantity.  It may or may not be important; I just wanted to know if it was correct.

>maybe I have to update my PSU to 700w, is it ok?
Perhaps - it seems odd that your +12v reading is not closer to 12, and that rail is very important.

Now I'm using Cooler Master RS-460-PCAR-D3 460W, All DC Output is +12V.
could you recommend any change for me.
Ex: PSU, Cooler System, or put out some part that no need
Aligatou!

did you calculate what you need yet?  it can be enough to reconfigure your setup, since the other +12V is ok

yeah I ready calculate the result just only 353W for current PC

then it should be enough to power the system - but maybe the other devices (disk dvd..) are also vonnected to the cpu rail - if you can put htem on the other rail, that would be fine
otherwise - another power supply as suggested